Complete harmony - absence of any such as this! (5,1,5,4)

I believe the answer is:

never a cross word

I'm a little stuck... Click here to teach me more about this clue!

'complete harmony absence of any such' is the definition.
I know nothing about this answer so I can't judge whether this works.

'this' is the wordplay.
I cannot really understand how this works, but
'this' could be 'crossword' (the crossword currently being solved is an example) and 'crossword' is present in the answer.
This explanation may well be incorrect...

'as' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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